Registering my bp plug in

I am having trouble understanding how to exactly register my plugin on buddy press and on word press. I see that many of the buddy press plugin have plug in groups. Is this added automatically? Also word press requests my plug URL when I try adding my plug in. Is this the address of where my plug in is stored or the address of my site for the plug in. I would like my buddy press group formed my plug in to be the address for my plug in for people to go look at. This is kind of which comes first the chicken or the egg. Do I create a group and buddy press first or submit with some fake address first and then change it.? On my understanding something. Would someone care to fill me in please.